My neighbour has 2 AP's, and told me one day I can use his wireless. He said, one was called 'livingroom' and is protected and to just use the other one. A month or so later I thanked him and found out that I wasn't even on his AP but on my other neighbour's on the other side of my house.

I was just polling email, I doubt they even noticed. Turns out the other AP I wanted I can't detect anyway.